Evidence for a monoclinic distortion in the ferroelectric Aurivillius phase Bi3LaTi3O12
Journal
Journal of Solid State Chemistry
Journal Volume
172
Journal Issue
2
Pages
389-395
Date Issued
2003
Author(s)
Abstract
An alternative chemical approach was used to prepare the ferroelectric Aurivillius phase Bi3LaTi3O12 (BLT1.00) at low temperature (450°C) leading to well-crystallized compounds at 750°C. The existence of 90°-oriented twin domains, characteristic of a ferroelectric state, was revealed in selected area electron diffraction and microdiffraction studies. Though the 3D reconstruction of the reciprocal lattice enables to propose the non-centrosymmetrical orthorhombic space group (SG) B2cm, a further convergent-beam electron diffraction study was undertaken in order to ascertain the symmetry. The monoclinic symmetry was clearly identified. BLT1.00 crystallizes in the polar SG B1c1 (no. 7, non-standard setting of P1c1) instead of I4/mmm, as previously reported. © 2003 Elsevier Science (USA). All rights reserved.
Publisher
Academic Press Inc.
Type
journal article